Synthesis of rutherfordium isotopes in the U-238(Mg-26, xn)(264-x)Rf reaction and study of their decay properties
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Isotopes of rutherfordium (Rf258-261) were produced in irradiations of U238 targets with Mg26 beams. Excitation functions were measured for the 4n,5n, and 6n exit channels. Production of Rf261 in the 3n exit channel with a cross section of 28-26+92 pb was observed. -decay of Rf258 was observed for the first time with an -particle energy of 9.05 0.03 MeV and an /total-decay branching ratio of 0.31 0.11. In Rf259, the electron capture/total-decay branching ratio was measured to be 0.150.04. The measured half-lives for Rf258, Rf259, and Rf260 were 14.7-1.0+1.2 ms, 2.5-0.3+0.4 s, and 22.2-2.4+3.0 ms, respectively, in agreement with literature data. The systematics of the -decay Q-values and of the partial spontaneous fission half-lives were evaluated for even-even nuclides in the region of the N=152,Z=100 deformed shell. The influence of the N=152 shell on the -decay Q-values for rutherfordium was observed to be similar to that of the lighter elements (96Z102). However, the N=152 shell does not stabilize the rutherfordium isotopes against spontaneous fission, as it does in the lighter elements (96Z102). 2008 The American Physical Society.
author list (cited authors)
Gates, J. M., Garcia, M. A., Gregorich, K. E., Duellmann, C. E., Dragojevic, I., Dvorak, J., ... Nitsche, H.
complete list of authors
Gates, JM||Garcia, MA||Gregorich, KE||Duellmann, Ch E||Dragojevic, I||Dvorak, J||Eichler, R||Folden, CMIII||Loveland, W||Nelson, SL||Pang, GK||Stavsetra, L||Sudowe, R||Tuerler, A||Nitsche, H